Sulphation and ammonia regeneration of a Pt/MnOx-CeO2/Al2O3 catalyst for NOx-assisted soot oxidation
Artikel i vetenskaplig tidskrift, 2018

The sulphur resistance and regeneration strategy of soot oxidation catalysts are critical to the application of catalytic diesel particulate filters (CDPFs). In the present work, Pt/MnOx-CeO2/Al2O3, Pt/Al2O3 and MnOx-CeO2/Al2O3 catalysts were sulphated and regenerated with ammonia. The soot oxidation activity of poisoned Pt/MnOx-CeO2/Al2O3 was recovered completely after 30 min reduction in 500 ppm NH3 at 550 degrees C. The amount, distribution and structure of sulphates were studied comprehensively for the sulphated and regenerated samples by thermogravimetric analysis (TGA), infrared (IR) spectroscopy, CO chemisorption and transmission electron microscopy (TEM). The NO oxidation of Pt catalysts was found to depend strongly on the particle size distribution, surface exposure and oxidation state of the precious metal. This, as well as the effect of the remaining surface sulphates, helped the regenerated catalysts achieve even higher catalytic activity for soot oxidation.

Författare

Yuxi Gao

Tsinghua University

Xiaodong Wu

Tsinghua University

Robin Nord

Chalmers, Kemi och kemiteknik

Hanna Härelind

Chalmers, Kemi och kemiteknik, Tillämpad kemi, Farmaceutisk teknologi

Duan Weng

Tsinghua University

Catalysis Science and Technology

2044-4753 (ISSN) 2044-4761 (eISSN)

Vol. 8 6 1621-1631

Ämneskategorier

Oorganisk kemi

Materialkemi

Annan kemi

DOI

10.1039/c8cy00027a